The alley leading to the apartment is pretty small and a little hidden away, but with a taxi via GRAB should bring you perfect. The room was very nice and clean, furthermore the guestladies tried their best to make us a comfortably as possible and give some local tips, just don't go expecting any conversation in anything but Thai.
Great location for exploring the nearby flower market and Khaosan Road. Nearest metro is about 10 minutes walk. Recommended.